CMC Field Guide vs MyUSNG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CMC Field Guide
Access rope rescue and access diagrams, reference charts, and how-to information instantly in the field. This free app provides essential rescue references, allows for note-taking, and supports offline access to downloaded content.
- Rope rescue and access diagrams
- Reference charts
- How-to information
- Bookmark and take notes
- Offline access to downloads
- Browse equipment and tutorials
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This free App allows quick access to rope rescue and access diagrams, reference charts, how-to information, and rescue references, all from the palm of your hand while out in the field. It's packed with reference charts, diagrams, and how-to information. With the CMC Field Guide App you can: Access rescue references instantly Bookmark and take notes on your favorite sections Download videos, guides, and manuals for offline use Browse equipment and information, tutorials, and product user manuals **Note** Updating this App will give you access to all of the functionality built into the most recent version of the App. Your saved information including Notes, References, and Attachments, will be carried through into the updated version.
MyUSNG
This app reports your device's location in US National Grid format. Easily copy your USNG coordinates to your clipboard with a single tap, or email them with a tap and hold. It also features a map to capture and view USNG locations.
- USNG location reporting
- One-tap copy to clipboard
- Tap-and-hold email function
- Map view for location capture
- USNG information resource
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MyUSNG reports the location of your device in US National Grid format (USNG). With a single tap on the screen, you will copy the USNG location into your clipboard. With a tap and hold, you can easily e-mail your USNG location. MyUSNG also includes a simple map that will let you capture the USNG of locations away from you, or center the map The United States National Grid (USNG) is a nationally consistent language of location in a user friendly format. USNG is commonly used during Search and Rescue operations in the United States. For more information about USNG visit usngcenter.org. MyUSNG is an Esri Labs project and not an official Esri product. MyUSNG is provided on an as-is-basis and you assume all risks associated with using this app.
Screenshots
Verdict
The clearest difference is rating: MyUSNG at 4.4 against CMC Field Guide's 4.0. MyUSNG also leads on review sentiment (100% vs 78%) and iOS requirement (11.0 vs 15.1). CMC Field Guide's advantage is update cadence (every 3 months vs every 10 months). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
MyUSNG holds the better App Store score, 4.4 against 4.0. Both are backed by a comparable volume of ratings — 24 and 9 respectively. Written reviews point the same way: 78% of CMC Field Guide's written reviews are positive against 100% of MyUSNG's.
CMC Field Guide ships an update every 3 months, MyUSNG every 10 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | CMC Field Guide | MyUSNG |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (24 ratings) | 4.4 (9 ratings) — better |
| Positive reviews | 77.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 24 — better | 9 |
| Update frequency | Every 3 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 11.0 — better |
| Further details — not scored | ||
| Size | 36 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | CMC Rescue, Inc. | Esri Online LLC |
Customer experience
CMC Field Guide
MyUSNG
Bugs and requests
CMC Field Guide
Reported bugs
15 issues- App crashes before it opens
- Unable to go beyond the first page
- Unable to access after updating
- App crashed twice
- Some links in the app don't work
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- Multiple glitches where pages cannot be opened
- Cannot open the app after update
- New upgrade crashes on opening items
- Could not find page all the time
- App doesn't open
- Half the tabs disappear
- Barely works (can rarely get into any of the pages)
- Add-on pop up when viewing PDF
- Poor display quality - not useful for reading
- Only M/A illustration shown is 1:1 after update
Requested features
2 requests- Enable landscape mode
- Update with latest techniques
MyUSNG
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CMC Field Guide
No in-app purchases
MyUSNG
No in-app purchases
Questions
Is CMC Field Guide free?
Is MyUSNG free?
Which has better reviews, CMC Field Guide or MyUSNG?
Do CMC Field Guide or MyUSNG have ads?
Which is updated more often, CMC Field Guide or MyUSNG?
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